Dave,
Don't know if this will help, but I remember a friend of mine doing dives off Holy Island, and St.Abb's Head, around 1969 or 1970.. From memory, one was a Mosquito, and the other thought to be a Whitley, although I don't remember exactly which was which - think the Mossie was St.Abb's Head.
Unfortunately, I lost touch with him some years back, so can't ask him !
Terry.